10 Determination of Molecular Formulas

10 Determination of Molecular Formulas - How many grams of...

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1 1 How many grams of water are produced when 22 g of propane burn? A)160 g B) 72 g C) 36 g D) 80 g E) 144 g 2 Solution to “How much …?” Need balanced reaction equation! Convert given quantities (e.g. mass) to moles, why? Because molecules react as molecules and the number of molecules is key. Set ratio of stoichiometric coefficients equal to ratio of amounts given and needed to find. Solve for the unknown amount in moles. Convert to units requested.
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3 Balanced reaction equation. Moles of propane available 22 g (1 mol / 44g) = 0.50 mol Ratios Amounts x = 2.0 mol 2.0 mol (18 g/mol) = 36 g C 3 H 8 + 5O 2 3CO 2 + 4H 2 O 8 3 2 8 3 2 5 . 0 1 4 H C mol O H mol x H C mol O H mol 4 Activity 03-4 Determination of Molecular Formulas p. 45 Calculate mass percent composition from mass data or an empirical or molecular formula. Determine an empirical formula from mass percent composition. Determine a molecular formula
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10 Determination of Molecular Formulas - How many grams of...

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